Networking problems
Hi.
On our company there are three LANs with different IP ranges. On one LAN there are new servers, on other LAN there are old servers and on the third lan there are the clients. Clients are Windows based and servers are Windows and linux based (windows mostly).
We currently have a problem. When making ping from a Linux server on the old lan I can see 50% packets lost and 50% packets DUP. If I make a traceroute I can see just 2 jumps: one from old server to router and one from router to new server.
We are also experimenting some intermitent connecting problems from clients to new server.
What can I do? Any idea to help me to diagnose and solve this problem?
Thanks in advance.
On our company there are three LANs with different IP ranges. On one LAN there are new servers, on other LAN there are old servers and on the third lan there are the clients. Clients are Windows based and servers are Windows and linux based (windows mostly).
We currently have a problem. When making ping from a Linux server on the old lan I can see 50% packets lost and 50% packets DUP. If I make a traceroute I can see just 2 jumps: one from old server to router and one from router to new server.
We are also experimenting some intermitent connecting problems from clients to new server.
What can I do? Any idea to help me to diagnose and solve this problem?
Thanks in advance.
ASKER
I think all are 1000mbps (1gbps). I think they are cisco but not sure which model. I will ask to my system administrator for the configuration of ports on switches/routers.
ASKER
Our expert on system area has restarted all routers, switches, servers, etc... and now all seems to work fine. Does this makes sense?
ASKER
Also he said that a Linux server we had is not well prepared for VLANs so this is why he had some network problems sometimes (but not always). Does this makes sense?
I think VLANs are created on new server's LAN but not on old server's LAN, where our Linux server is connected, so shouldn't be VLANs transparent to our Linux server?
I think VLANs are created on new server's LAN but not on old server's LAN, where our Linux server is connected, so shouldn't be VLANs transparent to our Linux server?
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ASKER
Thanks for your answer.
I now understand the point about tagged/untagged frames. However, if my Linux server doesn't accept tagged frames, then any of the ip packets would be received right? The problem is that some packets are lost and some are duplicated, but some of them are received, and our application works well sometimes, and doesn't work some times (because of this connect issue).
I now understand the point about tagged/untagged frames. However, if my Linux server doesn't accept tagged frames, then any of the ip packets would be received right? The problem is that some packets are lost and some are duplicated, but some of them are received, and our application works well sometimes, and doesn't work some times (because of this connect issue).
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ASKER
Sorry Mohammed, but I'm not understanding you. This linux server has just one NIC, connectad to a "normal" LAN (not VLAN). Then this LAN is connected to some VLAN.
Also application is working fine after restarting the switches/routers. So I guess the problem is not on the Linux server, am I right?
Also application is working fine after restarting the switches/routers. So I guess the problem is not on the Linux server, am I right?
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1. Make and model of switches
2. Make and model of router
3. Number of clients/devices involved
4. Connection speed for each client
What I believe is happening is that your router interface is most likely 100 mbps (if not 10 mbps) and it cannot keep up with the requests. Also check your switches to ensure there are no errors on any ports (issues such as speed, duplex settings, etc. can also cause issues).